AMERICAN ODONATA. 209 



3. Goniplius Kpiiiiceps Walsh. (Macrogomphus ? s.), Proc. Acad. Phil., p. 

 389, 1862. 



Ab. % 46-49 ; 9 48-52. H. w. % 35-37 ; 9 38-40. 



Antecub. f. w. 15-17; h. w. 10-12. 



Postcub. f. w. 11-13; h. w. 11-14. 

 Face brown, sometimes slightly paler (greenish) at the sutures; edges of lab- 

 rum and a more or less distinct small central spot, yellowish, its base greenish ; 

 frons above greenish, little or not interrupted in the middle by the brown of 

 the basal half. Mesothoracic half-color interrupted ; mid-dorsal carina black ; 

 doi-sal stripes isolated ; antehumeral stripe interrupted to form a spot above 

 and a line below, on one side in one specimen and on both sides in another the 

 two connected ; a straight, parallel-sided pale area between the humeral and first 

 lateral stripes; two lateral stripes, the enclosed pale area narrower than either 

 and constricted or interrupted above. Abdomen with a much reduced maculose 

 longitudinal mid-dorsal stripe. Legs black, paler basally, first femora brown 

 beneath. 



■J, . — Accessory genitalia of 2 blackish ; second hamule longer than in any other 

 species of the group, simple, curved forwards, the apical third directed anteriorly ; 

 segments 7-9 slightly dilated, about as in notatus and plagiafus; sides of 8 and 9 

 greenish, with reddish tinges, the extreme edges hlack ; 10 and the appendages 

 black or very dark. 



9 . — There is great variation in the development of the spine on either side 

 between each lateral ocellus and the eye; it may be very distinct, or hardly dis- 

 cernable. though a thickening of the carina at that point is evident. In the same 

 way the crest of the occiput varies in different specimens in a way that can 

 hardly be explained by shrinkage in drying; it is emarginate at the center, and 

 on either side of this may be a low uniformly convex edge, or it may be as shown 

 in the drawing (plate viii). Abdomen more robust than in the male; 8 and 9 

 scarcely dilated, colored about as in the male, edge of 9 entirely pale ; 3-7 with 

 conspicuous lateral spots; vulvar lamina about one-twentieth as long as the ster- 

 num of 9. 



Material Examined. 



2 S , Ohio ; 1 9 , Akrou, Ohio ; September 26, 1897 ; J. S. Hine, 

 collector. Ohio State University. 



1 I , Ohio ; J. S. Hine, collector. U. S. Nat. Mas. 



1 S (type of Stylurus segregans Needham), Quiver Creek, Ha- 

 vana, Illinois; June 23, 1896. Professor Needham. 



1 9 , Horton's Ford, Tennessee; August 14, 1899. C. C Adams. 



1 9 , Clinch River P. O , Tennessee ; Aug. 14, 1899. C. C. Adams. 



1 S , 1 9 , Allegheny River, Pittsburg, Pa. ; July 4, 1899. E. 

 B. Williamson. 



1 I , Bethlehem, N. Y. ; September 14, 1870 ; Lintner collection. 

 M C. Z. 



1 I , Albany, N. Y. M. C Z. 



This species is also recorded for Massachusetts. 



TRANS. AM. ENT. SOC, XXVII. (27) MAY, 1901. 



